Ksfosnc

8,5x-4,9x=12,24

3,6x=12,24

x=12,24÷3,6

x=3,4

сок111213

[tex]8.5x - 4.9x = 12.24 \\ 3.6x = 12.24 \\ x = 12.24 \div 3.6 \\ x = 3.4[/tex]